After big money bids for Alexandre Lacazette, Michy
Batshuayi and Carlos Bacca were rejected earlier on this summer, Slaven Bilic
decided to continue his pursuit for a striker slightly closer to home with
Ayew.

The Ghana forward joined the Welsh side on a free transfer
last season and made a considerable impact in the Premier League, scoring 12
goals in 34 appearances.

Speaking about his move, Ayew told West Ham's official
website: 'I am very proud and happy to be at this magnificent club.

'I am happy to be playing for these fans and I hope to make
the people very happy here. The club
have a lot of ambition and they also have a great manager.'They want to become a bigger club every year and with the
new Stadium and a new training ground, you can feel they are moving onto
another level and I want to be part of this project.

Swansea have reacted quickly to the sale of their star-man,
having agreed a club record £15m fee with Atletico Madrid for the signature of
Borja Baston.

The 23-year-old striker scored 18 goals in 34 appearances
for La Liga minnows Eibar last season and is due for a medical with the Welsh
side in the coming days.